CI: Fix all_supplementing_pythons wrt. freethreading Pythons

[skip changelog]

tests/all_supplementing_pythons.py

@@ -66,10 +66,13 @@ for nvra in supplementing_pkgs:
 
 
 # We use this hack to treat -devel and -libs packages as if they were not such
+# We also convert the freethreading packages to the exectuable name
 def normalize_name(pkgname):
     for suffix in '-devel', '-libs':
         if pkgname.endswith(suffix):
-            return pkgname.removesuffix(suffix)
+            pkgname = pkgname.removesuffix(suffix)
+    if pkgname.endswith('-freethreading'):
+        pkgname = pkgname.removesuffix('-freethreading') + 't'
     return pkgname